HP-35s in Hex mode Joel Setton (France) Unregistered Posts: 86 Threads: 8 Joined: Apr 2008 01-20-2010, 04:55 PM Folks, I guess I'm not the first person trying to use the 35s to do hexadecimal arithmetic... But the thing is next to useless! Looking at the example of a simple addition (page 11-5 in the user's guide), why does the 35s require a hex terminator, i.e. three additional keystrokes after every number? Once HEX mode is selected, couldn't they make it work this way: 1 2 F [enter] E 9 A + This is just plain-vanilla RPN... In decimal mode, arithmetic operators (such as + - * /) terminate the number being entered before performing the operation. Why not in hex mode? Didn't anyone at HP test this before releasing the code to production? Beats me. Joel Setton. Don Shepherd Unregistered Posts: 1,392 Threads: 142 Joined: Jun 2007 01-20-2010, 05:44 PM Joel, it is well known that number bases were not implemented well on the 35s. It is what it is and will not likely change. Martin Pinckney Unregistered Posts: 1,248 Threads: 33 Joined: Aug 2007 01-20-2010, 09:20 PM Try the 27s. In Hex mode, it provides soft keys for A-F. Effortless. Joel Setton (France) Unregistered Posts: 86 Threads: 8 Joined: Apr 2008 01-21-2010, 06:47 AM Right. I also have an HP-20S which is close to the 27s in this respect, but they are both (ewww...) algebraic. Ah, well. Joel Setton Dave Britten Unregistered Posts: 247 Threads: 26 Joined: Oct 2007 01-21-2010, 07:22 AM Get a 32sii (or 32s). The number base handling is nearly identical to the 20s, the only difference being you have to switch bases using a menu, which amounts to one extra keystroke. That said, the 20s is a surprisingly capable machine, and you can do some rather interesting tricks with INPUT, SWAP, and LAST. For example, here's a MOD program that uses no storage registers: ```LBL F = ( SWAP INPUT = / LAST ) IP * LAST = ( SWAP - LAST = RTN ``` Ken Shaw Unregistered Posts: 149 Threads: 7 Joined: Dec 2006 01-21-2010, 12:37 PM Lack of RPN on the 27S is it's big drawback. That aside, the ease-of-use is amazing. R-P conversions, base conversions, etc., are all very intuitive. I think it's very under-appreciated. Martin Pinckney Unregistered Posts: 1,248 Threads: 33 Joined: Aug 2007 01-21-2010, 02:40 PM Quote: Lack of RPN on the 27S is it's big drawback. *IF* you are an RPN fanatic. Which I am not. Martin Pinckney Unregistered Posts: 1,248 Threads: 33 Joined: Aug 2007 01-21-2010, 03:03 PM Well, I forgot to mention the 42s also has an excellent implementation, with soft keys for A-F. But as Dave pointed out, the 32sii method is pretty slick, too. Dave Britten Unregistered Posts: 247 Threads: 26 Joined: Oct 2007 01-21-2010, 04:42 PM Quote: I think it's very under-appreciated. Based on the prices that model usually commands, I'm going to have to disagree with you. :) « Next Oldest | Next Newest »

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